Translation of sermonize in Spanish

We agreed to stay in the room with no windows and unpacked our bags. We wanted to have dinner and went out to a Sushi restaurant a friend told us about. It was a great place with great atmosphere.
It must have taken them years and ten's of thousands of workers to accomplish the tasks of constructing such spectacular compounds. We took many pictures and walked back to the taxi.
I'm writing you in English because I don't have a lot of time and writing in German will take me a long time. Just a few corrections: you can not say in English How you do, you need to say How do you do...